US11180797B2 - Molecular computing component and method of molecular computing - Google Patents
Molecular computing component and method of molecular computing Download PDFInfo
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- US11180797B2 US11180797B2 US15/998,743 US201615998743A US11180797B2 US 11180797 B2 US11180797 B2 US 11180797B2 US 201615998743 A US201615998743 A US 201615998743A US 11180797 B2 US11180797 B2 US 11180797B2
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- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
- C12Q1/6844—Nucleic acid amplification reactions
- C12Q1/6846—Common amplification features
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- C12Q2521/00—Reaction characterised by the enzymatic activity
- C12Q2521/10—Nucleotidyl transfering
- C12Q2521/101—DNA polymerase
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- C12Q2521/00—Reaction characterised by the enzymatic activity
- C12Q2521/30—Phosphoric diester hydrolysing, i.e. nuclease
- C12Q2521/301—Endonuclease
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- C12Q2521/00—Reaction characterised by the enzymatic activity
- C12Q2521/30—Phosphoric diester hydrolysing, i.e. nuclease
- C12Q2521/319—Exonuclease
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- C12Q2565/00—Nucleic acid analysis characterised by mode or means of detection
- C12Q2565/50—Detection characterised by immobilisation to a surface
- C12Q2565/537—Detection characterised by immobilisation to a surface characterised by the capture oligonucleotide acting as a primer
Definitions
- the present invention relates to a molecular computing component and a method of molecular computing.
- the PEN-DNA toolbox uses a 3-enzyme machinery (polymerase, exonuclease, nickase) to drive the fabrication, exchange and degradation of signal-carrying DNA strands: a DNA-polymerase elongates a short input strand that hybridizes on the input 3′ side of a matching DNA template (a single-stranded oligonucleotide of a few tens of bases long); a nickase site-specifically nicks the resulting full duplex, releasing both the input and a new single strand DNA output complementary to the output side of the template.
- a DNA-polymerase elongates a short input strand that hybridizes on the input 3′ side of a matching DNA template (a single-stranded oligonucleotide of a few tens of bases long); a nickase site-specifically nicks the resulting full duplex, releasing both the input and a new single strand DNA
- the exonuclease (usually of the RecJ family, but it can be another exonuclease) unspecifically degrades all unprotected single-stranded oligonucleotides but not templates or reporter strands, which are protected using DNA modifications or substitutions, maintaining the system in a responsive out-of-equilibrium state.
- the PEN-DNA toolbox as a solution-phase biomolecular reaction networking scheme, has allowed the construction of various dynamic circuits such as multistable, oscillatory and excitable systems (see, for example, NPL 3-5). For example, a molecular program can be used to create a bistable molecular mixture.
- bistable systems can be used to detect some molecular targets, without being affected by molecular noise or background reactions, because the switching threshold is set to be above such noise or background. As such, molecular systems programmed to display bistability have an important potential for the selective detection of molecular targets.
- the computation is performed in an amorphous aqueous solution (typically in a test tube) that limits multiplexing capabilities because it is difficult to have multiple independent programs running simultaneously in the same sample.
- amorphous aqueous solution typically in a test tube
- multiple circuits would need to share the enzymatic machinery and may interact in an undesired way (NPL 2, 5, 6), for example, by spurious binding of DNA strands that are not expected to interact in the designed circuit.
- NPL 2, 5, 6 undesired way
- each circuit should be prepared in a different test tube, so if one wants to perform different tasks, this involves complex manipulations and multiple pipetting of many components to prepare each test tube, increasing the risk of experimental errors.
- An object of the present invention is to provide a molecular computing component and a method of molecular computing that can be applied to detect rare molecular targets while filtering out background noise and avoiding unspecific signal generation and false positives but is also miniaturized, easy to use for the end user, and allows parallel operations in one single tube.
- the present description provides a component for detection of molecular targets, the component comprising: a microsphere including pores, at least some of which are open on a surface of the microsphere, and a plurality of modules attached to the microsphere wherein each of the modules is a continuous sequence of nucleic acid bases, and multiple copies of each of the modules are linked to the microsphere.
- the modules grafted on the microsphere locally cooperate to evaluate chemical signals in their environment, compute a response and generate a reporting signal if appropriate.
- the component comprises a plurality of the microspheres, and the microspheres concurrently exist in an identical sample.
- the microspheres are of different types, and each of the microspheres has a distinct combination of modules, thereby each of the microspheres performs a different function.
- the different types of microspheres can be distinguished by the combination of fluorescent barcodes grafted thereon at the same time of synthesis.
- a molecular circuit with sensing function is encoded by a combination of the modules attached to the microsphere, the modules cooperate essentially locally on the microsphere through exchanges of short DNA strands and the exchanges define a function of the component.
- the component comprises a plurality of the microspheres, each of the microspheres performs its function independently in an identical solution.
- the present description also provides a method of molecular computing with a component comprising a plurality of microspheres including pores, at least some of which are open on a surface of the microspheres, and a plurality of modules grafted on the microspheres wherein each of the modules is a DNA strand, the method comprising steps of designing the modules and their combinations to create one or more molecular programs; attaching each molecular program to a batch of the microspheres; bringing a set of these grafted microspheres, each of which carries its own molecular program, into contact with a solution containing one or more target compounds and a mixture of enzymes; and incubating the grafted microspheres with the mixture of enzymes at a constant temperature so that DNA production and exchange happen locally on each microsphere in between the grafted modules according to a specific molecular program of the microsphere.
- the mixture of enzymes contains one or more of such activities as polymerase, nickase and exonuclease.
- the modules include a first and second template, the first template is an amplification template, the second template absorbs leak reaction and avoids unspecific spontaneous amplification when the microsphere contacts with the mixture of enzymes, so that DNA is amplified exponentially only when the first template receives stimulation above a predetermined concentration threshold for a specific target specie.
- the modules include a third template, the third template is a target-conversion template, the target-conversion template is able to capture a target nucleic acid strand and consequently stimulate the first template so that the threshold is crossed, amplification happens, and existence of the target strand is sensed.
- the modules include a fourth template, the fourth template is a reporter strand, the reporter strand generates a fluorescence signal using a product of the amplification template so that existence of the target strand is reported.
- the molecular computing component is programmable, modular, miniaturized, autonomous, reusable, active and has multiplexing capabilities.
- FIG. 1 is a set of schematic views of CompuSpheres.
- FIG. 2 is a table of sequences used throughout the present embodiment.
- FIG. 3 is a set of schematic views of PEN-DNA toolbox.
- FIG. 4 is a set of schematic views showing experimental results of the degradation of free templates by an exonuclease.
- FIG. 5 is a first table showing experimental condition in Example 1 ( FIG. 4 ).
- FIG. 6 is a set of schematic views showing interaction between polymerase and 5′ streptavidin-conjugated DNA strands.
- FIG. 7 is a second table showing experimental condition in Example 1 ( FIG. 6 ).
- FIG. 8 is a set of schematic views showing kinetic of biotin-DNA exchange.
- FIG. 9 is a third table showing experimental condition in Example 1 ( FIG. 8 ).
- FIG. 10 is a set of schematic views showing the implementation of an autocatalytic loop on CompuSpheres.
- FIG. 11 is a first table showing experimental condition in Example 2 ( FIG. 10 ).
- FIG. 12 is a set of schematic views showing autocatalytic loop on CompuSpheres.
- FIG. 13 is a second table showing experimental condition in Example 2 ( FIG. 12 ).
- FIG. 14 is a set of schematic views of detection of the presence/absence of DNA strand.
- FIG. 15 is a table showing experimental condition in Example 3.
- FIG. 16 is a set of schematic views of duplex assay for simultaneous detection of detection of a and 8 strands.
- FIG. 17 is a table showing experimental condition in Example 4.
- FIG. 18 is a set of schematic views of CompuSpheres embedding a bistable system (amplification+leak-absorbing template modules) and a target-conversion module.
- FIG. 19 is a table showing experimental condition in Example 5.
- FIG. 20 is a set of schematic views showing experimental results of target detection with CompuSpheres grafted with a specific reporter strand.
- FIG. 21 is a table showing experimental condition in Example 6.
- FIG. 1 is a set of schematic views of CompuSpheres.
- FIG. 2 is a table of sequences used throughout the present embodiment.
- the respective figures disclose an embodiment involving fabrication of autonomous programmed particles by grafting all DNA encoding components of a PEN-DNA molecular program within porous microspheres.
- FIG. 1 it is possible to synthesize in parallel millions of microspheres implanted with identical or different programs.
- the novelty of these microspheres lies in the pre-encoded information-processing capability of the particle, which comes from its decoration by the grafting of the rule-encoding DNA templates of the PEN DNA toolbox.
- FIG. 1 shows a schematic representation of CompuSphere.
- DNA-based molecular programs are transposed from the solution-phase format to particle-supported format by grafting a set of encoding modules on porous microspheres.
- the resulting DNA-programmed particles are suitable for biosensing applications thanks to easy storage, buffer exchange, and high multiplexing capabilities. In comparison with other particles whose outer surfaces are decorated with DNA, used in various biotechnological applications.
- CompuSphere more specifically refers to porous particles that localize an information-processing molecular program in their bulk, thanks to a co-grafting of different modules (including for example one or more target-conversion module, one or more amplification module, one or more thresholding module, one or more reporter module and one or more barcode module, as defined below).
- CompuSpheres can be prepared in advance with a defined mixture of encoding modules and barcodes, their usage is very simple to end-users, who just need to place them in contact with a liquid solution and incubate at constant temperature to start operations (or possibly perform a sequence of contact/exchange steps with various solutions).
- the present embodiment therefore proposes the packaging of one or multiple multicomponent molecular program onto easy-to-handle particles and brings the possibility of highly parallel, information-processing operations with limited use of reagents. It is expected to bring a major breakthrough in the usage of complex molecular protocols, and in particular to impact miniaturized, multiplexed, smart molecular diagnostics approaches (biosensing).
- an experimental procedure starts by functionalizing mesoporous particles with a defined mixture of DNA modules (oligonucleotides that act as rules of the molecular program, and can be for example target-conversion template, amplification template, thresholding template, reporter probe, etc. and are modified for surface binding) and a fluorescent barcode element.
- DNA modules oligonucleotides that act as rules of the molecular program, and can be for example target-conversion template, amplification template, thresholding template, reporter probe, etc. and are modified for surface binding
- a fluorescent barcode element oligonucleotides that act as rules of the molecular program, and can be for example target-conversion template, amplification template, thresholding template, reporter probe, etc. and are modified for surface binding
- the CompuSphere are washed and can be stored for several months at 4° C. or possibly dried and kept at room temperature.
- An application of these CompuSphere will typically consist in exposing them to the sample containing one or more targets (the biomole
- each CompuSphere will compute a response depending on the presence/absence and concentration of their specific target in the sample, and the result will materialize as amplification of DNA, which can be detected by looking at the fluorescent barcode and reporter signals of each CompuSphere.
- biotin-avidin linkage is used to attach the oligonucleotides to the porous microsphere, but many other grafting chemistry could be used to attach the DNA instructions to the porous microspheres including but not limited to amino coupling (NPL 13-15), disulfide bonds (NPL 16), self-assembled monolayer (NPL 17), other thiol-reactive chemistry (NPL 18), click chemistry (NPL 19), dual-biotin-avidin linkage (NPL 20), nucleic linker-mediated hybridization (NPL 21) and any covalent ligation and non-covalent immobilization chemistry.
- each independent particle is designed to compute the presence/absence of a specific DNA or RNA target above a user-defined threshold
- each module can be designed and attached independently or jointly on the microspheres making the programming of microspheres versatile.
- Multiplexable (able of multiplex operation): particles carrying different molecular programs can perform different sensing operations in the same solution.
- the design rules of the encoding template's sequences does not change, but one needs to add appropriate spacers and linkers. Given these adjustments, the qualitative dynamic behavior, and hence the molecular programming rules, are basically the same on the particles as they are in the solution.
- CompuSpheres exhibit autonomous computational capabilities, applicable for example to the detection of nucleic acid targets.
- CompuSpheres are suitable for multiplex assay. Different CompuSpheres in the same solution can perform different tasks and results can be extracted using fluorescent reporters and barcodes.
- a versatile assay can be designed by coupling a bistable amplification motif (the same for all targets) and target-conversion modules (specifically designed for each target of interest), using simple design rules.
- Unspecific reporters such as SybrGreen or EvaGreen provide a straightforward way to monitor the results of CompuSphere based protocols.
- a specific reporter strategy can be designed to provide higher signal, higher detection specificity or to multiplex assays.
- One CompuSphere can integrate a variety of decorating templates cooperating to provide an integrated function.
- one CompuSphere can carry an amplification module, a leak-absorption module, a target-conversion module, a specific reporter strand and a spectrally orthogonal fluorescent barcode.
- biotin and bioteg refer to biotinylated synthons, respectively using aminoethoxy-ethoxyethanol linker and the longer triethylene glycol linker.
- “*” denotes a phosphorothioate backbone modification and “p” designates a 3′ phosphate modification.
- the nicking enzyme recognition site is indicated in bold.
- Example 1 shows adjustment of the PEN-DNA toolbox for microsphere-conjugated templates. Sequences used in the example are shown in the table of FIG. 2 . Before Example 1, a review of the PEN-DNA toolbox will be given.
- FIG. 3 is a set of schematic views of PEN-DNA toolbox.
- FIG. 4 is a set of schematic views showing experimental results of the degradation of free templates by an exonuclease.
- FIG. 5 is a first table showing experimental conditions in Example 1.
- FIG. 6 is a set of schematic views showing interaction between polymerase and 5′ streptavidin-conjugated DNA strands.
- FIG. 7 is a second table showing experimental condition in Example 1.
- FIG. 8 is a set of schematic views showing the kinetics of biotin-DNA exchange on streptavidin-conjugated particles.
- FIG. 9 is a third table showing experimental conditions in Example 1.
- the PEN-DNA toolbox provides a programmable way to design artificial molecular devices such as clocks, memories, logic elements etc. using DNA-encoded instructions as described in NPL 1, 2, 4 and 5. These systems perform as well-mixed molecular systems in test tubes held at a constant temperature in the presence of some enzymes.
- the PEN-DNA toolbox is a solution-phase biomolecular reaction-networking scheme where short synthetic DNA oligonucleotides are used to encode the connectivity information of the circuit. As shown in FIG.
- the dynamic unfolds upon processing by a three-enzyme universal machinery a DNA-polymerase elongates an input strand that hybridizes on the input side (3′) of a matching template; a nickase site-specifically cuts the resulting full duplex, releasing both the input and a new output.
- the exonuclease unspecifically degrades all unprotected oligonucleotides (i.e. everything except templates), maintaining the system in a responsive out-of-equilibrium state.
- the cascading of the different modules allows the building of molecular programs and circuits.
- Example 1 regards adjustments necessary to adapt the PEN-DNA toolbox for porous microsphere-supported format. Enzymatic activity on immobilized DNA substrates was intensively studied and reported in the literature and it was shown, for example, that tethered DNA primers are typically less active in solid-phase PCR (Polymerase Chain Reaction) than in solution phase PCR, due to thermodynamic (DNA hybridization), kinetic (enzyme and products diffusion), and spatial (steric hindrance) constraints (see, for example, NPL 18, 22 and 23).
- streptavidin protects 5′-biotinylated template from degradation by RecJ exonuclease, even in the absence of other modifications:
- Molecular programs working in batch conditions such as those described in NPL 1-5, 24 and 25, use an exo(ribo)nuclease activity that guarantees time-responsiveness of the system by degrading produced species.
- the PEN-DNA toolbox in particular uses a thermostable 5′ ⁇ 3′ single strand-specific exonuclease called ttRecJ (NPL 26). Therefore, templates have to be protected, or they would be digested by the enzyme.
- templates are typically protected by site-specific incorporation of phosphorothioate backbone modifications in their 5′ extremity, previously used in antisense oligonucleotide synthesis to provide nuclease-resistance (NPL 27).
- Other backbone nuclease-protecting modifications are available, including but not limited to phosphotriester, boranophosphonate, alkylphosphonate, phosphoramidate, guanidinium, N-(2-aminoethyl)glycine (used for peptide nucleic acid synthesis), etc.
- ODN1 An oligonucleotide (ODN1) having a single biotin modification at its 5′ end, but no backbone or nucleoside modification, was attached- or not-to a streptavidin and incubated with the exonuclease. The progress of the reaction was followed through the fluorescent signal emitted by EvaGreen (even if this dye is mostly a double strand specific reporter, a detectable fluorescent signal is produced in the presence of the single stranded DNA templates, and decreases if those templates are digested). The result of this experiment, depicted in FIG. 4 , demonstrates that free templates are quantitatively degraded by the exonuclease within 30 minutes, while streptavidin-bound templates are fully protected.
- FIG. 4 illustrates that biotin moiety in 5′ protects templates from degradation by exonuclease in the presence of streptavidin, even in the absence of other modifications.
- 100 nM of template with a 5′ biotin modification is incubated with or without streptavidin before being exposed to the exonuclease (ttRecJ).
- the template alone is quantitatively degraded by the enzymatic activity while the template linked to streptavidin is fully protected. This result demonstrates the protection of oligonucleotides by the 5′biotin/streptavidin linkage toward exonuclease activities.
- the fluorescence signal corresponding to a shows an amplification profile with first an exponential amplification phase followed by a plateau (that corresponds to the steady state where the production of triggers equals their degradation by the exonuclease ttRecJ). Finally the depletion of dNTPs leads to the end of reaction and the return to initial level (no more production, only degradation).
- the template T1 is extended with 0 to 3 deoxyadenosines ahead of the biotin moiety (bioteg or biotin) located on its output side (5′ end) ( FIG. 6 ).
- FIG. 7 shows a table for experimental condition. The amplification does not occur if the polymerase reads across the (poly) dA linker, due the production of 3′ mismatched triggers that cannot prime further polymerization on other templates.
- FIG. 6 illustrates the steric interaction between the polymerase and 5′-streptavidin groups blocking the polymerization for the last nucleotides of the template.
- FIG. 6A shows a schematic representation of the indirect assay used to determine how many nucleotides the polymerase misses when templates are conjugated to streptavidin. From this assay, it is determined that the polymerase misses (at least most of the time) the last one or the last two nucleotides if the template is tethered through a bioteg or biotin linker, respectively.
- FIG. 8A illustrates kinetic of biotin-DNA exchange for saturated streptavidin-conjugated particles.
- FIG. 8B illustrates kinetic of biotin-DNA exchange for unsaturated streptavidin-conjugated particles.
- CompuSpheres are functionalized with a total less than 2 nmol of oligonucleotides per milligram of particles (whereas the saturation level is around 3.3 nmol per milligram particles). It must be noted that other options are available for the tethering of templates on the solid support, such as dual biotin modification of the template, which are classically used for solid-state PCR applications using streptavidin-modified support (see, for example, NPL 20).
- DNA attachment chemistries are known to attach DNA on supports using for example covalent linkages (NPL 13, 14 and 18). These options could be readily adapted to the present context to avoid any exchange of strands between particles.
- non-polymerizable spacers such as polyethylene spacers or aliphatic spacers can be used to link two oligonucleotides, which then act as independent substrates for the polymerase (for such constructions, see NPL 38 and 39 and patent document U.S. Pat. No. 8,252,558 B2). Therefore, instead of being directly attached to the surface of the microsphere, some modules could be attached to the free end of other tethered modules using such spacers.
- Example 2 regarding running of a basic polymerase-nickase amplification system localized on porous microsphere.
- FIG. 10 is a set of schematic views showing the implementation of an autocatalytic loop on microspheres.
- FIG. 11 is a first table showing experimental condition in Example 2.
- FIG. 12 is a set of schematic views showing autocatalytic loop on microspheres.
- FIG. 13 is a second table showing experimental condition in Example 2.
- microsphere-supported templates perform qualitatively identically as templates in their free-diffusing form (i.e. in a homogeneous solution). It is further shown here that the amplification reaction happens only within a very small fraction of the total solution volume, which is mostly the volume contained within the spheres, in contrast to classic solution based approaches, where amplification reaction is distributed homogeneously over the entire volume of the reaction.
- the template-grafted microspheres behave autonomously in the solution and can maintain their active state in the face of diffusion, even when a unique microsphere is present in a system of a few microliters and thus the active volume where the reaction is localized is less than 1/10 6 of the total sample volume.
- biotinylated amplification template ⁇ to ⁇ was attached to the streptavidin-modified Sepharose beads by incubating 300 pmol of template with 5 ⁇ L of the stock suspension of microspheres under continuous agitation for 15 minutes in a high ionic strength binding buffer (Tris-HCl pH7.9 20 mM, EDTA 10 mM, NaCl 1M, Tween20 0.2%). Functionalized CompuSpheres (CS ⁇ M ) are then washed and stored in an appropriate buffer up to 6 months (Tris-HCl, pH 7.0, 2 mM MgSO 4 , 100 mM NaCl).
- microspheres are poured in the reaction mix obtained by combining the components according to the table of FIG. 11 .
- a double strand specific dye (Evagreen) is introduced to allow a fluorescent monitoring of the reaction. This compound produces a bright green fluorescent signal in the presence of double stranded DNA, and limited fluorescence in the presence of single-stranded DNA or monomers such as dNTP and dNMP.
- the mixture of microspheres and reaction mix is then introduced in an incubation chamber made in-between two microscope coverslips separated by a spacer and sealed with epoxy adhesive (Araldite®).
- This incubation chamber is transferred to an Olympus IX71 inverted microscope equipped with a CoolLED illumination source and an iXon3 897 EM-CCD camera (Andor).
- the temperature of the incubation chamber is maintained at 45° C. thanks to a transparent thermoelectric heating plate (Tokai-Hit). Time lapses are recorded using a 2 ⁇ or 4 ⁇ objectives magnification through the open source microscopy software ⁇ Manager 1.4.
- FIG. 10 illustrates the behavior of the autocatalytic loop on microsphere, where a microsphere is functionalized with an amplification template that encodes a positive feedback loop (autocatalysis) leading to DNA amplification when incubated in the presence of a polymerase, a nickase and dNTPs.
- the microspheres are contacted with a mixture of polymerase, exonuclease, nickase activities and incubated at 45° C.
- the reaction is monitored by fluorescence microscopy with a double strand specific dye (Evagreen).
- the amplification profile first order amplification, steady state and return at the initial stage after dNTPs exhaustion
- the microspheres are therefore performing the function encoded by their decorating DNA templates.
- FIG. 10B illustrates that CS ⁇ M efficiently amplifies the a strand, which results in a sharp fluorescence increase.
- the signal After an exponential phase, the signal reaches a stable plateau corresponding to the steady state (where the production of a by polymerase/nickase/template equals the degradation by the exonuclease).
- the production stops and the gradual degradation of the a strand brings the templates back to their initial single-stranded state, which result in a decrease of the fluorescence.
- FIG. 12 shows a table for experimental conditions.
- CompuSpheres cannot receive compounds from neighboring beads and therefore any reactivity observed on the microsphere can be considered as an autonomous properties of that microsphere, not as a collective behavior of many microspheres.
- FIG. 12 illustrates that a unique CompuSphere is incubated in a large chamber and the fluorescence signal still reveals an exponential amplification localized on the microsphere.
- the sharp signal increase observed in FIG. 12 illustrates that the programmed particle is able to autonomously perform the amplification reaction and sustain a high production rate for more than 18 hours.
- the behavior reproduces the one observed for multiple microspheres in the chamber, except that the return to the basal signal is not observed. This is because the single microsphere consumes dNTP much slower that the many-bead population can, and the high state can therefore be maintained for a much longer time.
- the sustained high fluorescence level demonstrates that the reactivity of template-grafted microspheres contacted with the enzymatic machinery is an autonomous property of each microsphere, not a population level behavior. It must be noted that Zhang et al.
- the single bead in this case was grafted with a single DNA sequence
- the focus of the present invention is to attach a complete molecular program, that uses local exchange between multiple DNA sequences to provide improved sensing capability (for example, background free detection using a leak-absorption module, as shown in the following Example 3, or re-programmable detection using additionally a target-conversion module, as shown in Example 5).
- Example 3 regarding the fact that a more complex molecular program, using more than one module, can also run in a microsphere-supported format. Specifically, we show that CompuSphere grafted with a bistable program based on two templates can be used to report on the presence/absence of specific nucleic acids while avoiding background amplification.
- FIG. 14 is a set of schematic views of detection of the presence/absence of a DNA strand.
- FIG. 15 is a table showing experimental conditions in Example 3.
- isothermal polymerase-nickase amplification systems display a background amplification, in the sense that even in the complete absence of initial trigger, an exponential amplification is eventually observed (see, for example, NPL 42 and 43). This limits the usability of these systems, as well as many other isothermal DNA amplification schemes, for the detection of nucleic acids.
- the first module is an amplification template showing a partial repeat structure ( ⁇ to ⁇ ) complementary to the sequence of interest ( ⁇ ), while the second is a leak-absorbing template (pT ⁇ ), which absorbs the leak reaction from the autocatalytic template and allows the adjustment of the amplification threshold ( FIG. 14 ).
- Absorption of the leak is obtained because the leak-absorbing template reacts faster with the amplified input/output DNA strands and converts them to an inactive form, but is present in lower concentration.
- the exonuclease present in the solution along with the polymerase and nickase, is used to process the wasted products.
- autocatalytic amplification can start only when the leak-absorption capacity threshold is crossed. It is therefore expected to obtain each microsphere as a bistable unit that stays in the OFF state in absence of target as a triggering event.
- target exposure at a concentration exceeding a certain threshold
- we expect that the supported template will catalyze the amplification resulting in sharp fluorescent increase and that the microspheres will switch to a stable ON state indicating detection.
- Reaction assembly three different reactions are assembled by introducing the CS ⁇ B in the master mix (reaction buffer+enzymes, shown in a table of FIG. 15 ) supplemented with 0, 8 or 32 nM of target ( ⁇ , CATTCTGACGAG, SEQ ID NO: 15).
- Each of the three samples is heated at 45° C. and imaged by time-lapse epifluorescence microscopy using the double-strand specific dye Evagreen (see Example 2).
- the fluorescence signal of each bead indicates the progress of the amplification reaction.
- a low fluorescence signal corresponds to the “OFF” state, when the autocatalytic reaction is below the threshold and does not amplify the signal.
- a sharp fluorescence increase corresponds to the amplification reaction bringing the CompuSphere to its “ON” state, which is then sustained for a very long time (if sufficient dNTP is included in the buffer, see Example 2).
- FIG. 14 illustrates the results of the experiment. Specifically, FIG. 14 illustrates detection of the presence/absence of a DNA strand using microspheres functionalized with a mixture of amplification template and leak-absorbing template (CS ⁇ B ).
- the part A (the uppermost part) illustrates principle of the detection scheme.
- the part B (the lower left part) illustrates time traces obtained for three samples: CS ⁇ B are incubated with the reaction mix supplemented with 0, 8 or 32 nM of target strand a, respectively.
- the part C (the lower right part) illustrates fluorescence images b and (a). In absence of target, CompuSpheres stay in their inactive state, reporting an “OFF” response.
- CompuSpheres sense its presence and amplify the sequence, leading to a shift to a strong fluorescence state (“ON” state).
- ON a strong fluorescence state
- FIG. 14 in absence of target (0 nM a), CS ⁇ B stays in the “OFF” state for up to 1000 minutes. If the target is introduced in the sample (32 nM), the threshold is exceeded and the microspheres switch “ON” and emit a strong fluorescence signal. At an intermediate concentration of target (8 nM a), CS switch to the “ON” state with a delay (about 400 minutes).
- microparticles embedding a bistable program are able to detect the presence of a specific target and display the corresponding fluorescent response without being sensitive to background amplification in the absence of target.
- Example 4 regarding multiplex assay for the simultaneous detection of two single-strand DNA targets present in the same sample.
- FIG. 16 is a set of schematic views of duplex assay for simultaneous detection of a and 8 strands.
- FIG. 17 is a table showing experimental conditions in Example 4.
- CompuSpheres are suitable for such purpose since they can have different molecular programs on different particles but perform independently in the same solution. Each particle type is specifically designed to detect autonomously and individually the presence/absence of a different target molecule and to report this information using a fluorescent signal. Additionally, different CompuSpheres carrying different tasks can be made easily distinguishable with the use of fluorescent barcodes and therefore can use a unique readout channel (in contrast to multiplex assays using spectrally resolved fluorescent reporters, limited to four to five targets).
- FIG. 16 illustrates that each programmed particle can be distinguished using its fluorescent barcode, detects independently and specifically the presence/absence of its target strand and adopts the expected “ON” (in presence of the cognate target)/“OFF” state (in absence of trigger).
- two CompuSpheres batches are synthesized; one functionalized with a bistable module that senses a, the other embedding a bistable module whose input is B.
- the two CompuSpheres populations are separately barcoded, pooled together, supplemented with the reaction mix and exposed to the target(s). The computation of each bead is monitored by fluorescence microscopy.
- Example 5 regarding coupling of a two-module bistable motif (background-free amplification) to a target-conversion module (detection).
- FIG. 18 is a set of schematic views of CompuSpheres embedding a bistable system (amplification module+leak-absorbing module) and a target-conversion module.
- FIG. 19 is a table showing experimental condition in Example 5.
- a huge advantage of colocalizing the detection and the amplification on a microsphere whose volume is much smaller than the sample to be assessed is that one can conceive a versatile design composed of a single amplification loop (and a unique readout) coupled to a variety of target conversion module, each designed for a different target and being attached a different CompuSphere type. Moreover, using the barcoding strategy presented above the different sensing assay can be performed at the same time and in the same solution.
- CompuSpheres CSß B bearing a bistable module (amplification template ßtoß Biotin*C*G*A*TCCTGAATGCGATCCTGAAT-p, SEQ ID NO: 11) and leak-absorbing template pTB, Biotin*A*A*AAAACGATCCTGAATG-p, SEQ ID NO: 14) were synthesized. Particles are subsequently supplemented with a target conversion module (template ⁇ toß). These particles are named CS ⁇ ß B .
- CSß B and CS ⁇ ß B are separately incubated in the reaction mix (shown in the table of FIG. 19 ) containing 0 or 10 nM of the target a and the reaction is monitored by fluorescence microscopy at 45° C.
- FIG. 18 shows that CompuSpheres embedding a bistable module (ßtoß and pTß) and a target-conversion module ( ⁇ toß) are able to detect the presence of the targeted strand (error bars are represented in graphs).
- CompuSpheres CSßB without the target-conversion module are insensitive to the presence of the target (a strand). This is because only the colocalized target-conversion module is able to capture the target and uses it to trigger locally the switch of the bistable module, resulting in the observation of amplification on the particle CS ⁇ ß B (going to the “ON” state).
- both CompuSpheres remain in their “OFF” state for more than 500 minutes. This result can be extended to design other target-conversion modules for different targets, in order to create a highly multiplexed assay.
- FIG. 20 is a set of schematic views showing experimental results of target detection with CompuSpheres grafted with a specific reporter strand.
- FIG. 21 is a table showing experimental conditions in Example 6.
- a reporter strand is added during the CompuSphere synthesis ( FIG. 20A ).
- This reporter strand is composed of the stem-loop structure extended with a 5′ polyT tail ahead of the biotin moiety. Both extremities of the stem are modified with a fluorophore and a quencher.
- the loop is complementary to the trigger of the bistable module. Once the trigger binds the loop, the stem is destabilized and the trigger is elongated by the polymerase. This irreversible step keeps the fluorophore away from the quencher, resulting in an enhanced fluorescence emission.
- Microparticles (CS ⁇ ß BR ) are functionalized with the 4-strand program (amplification template, leak-absorbing template, target-conversion template and the reporter, shown in a table of FIG. 21 ). After washing, CS ⁇ ß BR are incubated at 45° C. with the enzymatic machinery and a concentration of target a ranging from 0 to 10 nM. The reaction is monitored by fluorescence microscopy through the red channel (Cy5 emission fluorescence).
- FIG. 20A is a schematic illustration of CompuSphere embedding a 4-strand program (CS ⁇ ß BR ).
- FIG. 20B illustrates a mechanism using the dye/quencher probe R8.
- FIG. 20C illustrates time traces and error bars for four samples: CS ⁇ ß BR are incubated together with the reaction mix and the target (0, 0.1, 1 or 10 nM of ⁇ ).
- FIG. 20D shows fluorescence images for one CompuSphere of each sample.
- the present embodiment removes the constraints linked to water-in-oil partitioning or microfabrication. Instead, the present embodiment provides the one-pot pre-synthesis of millions of “smart” microspheres with a precise control on the constituents and a high versatility (theoretically, any DNA-program can be designed and assembled onto porous particles). Multiplexing orthogonal molecular programs is also possible thanks to the parallel particle functionalization and barcoding and subsequent pooling in a mixed population that can be used in a common sample. Besides, particles can be easily handled and subject to various treatments or storage conditions (drying, freezing, buffer exchange . . . ), because they consist only of quite stable components (polymeric matrix, DNA).
- the molecular program can be designed to filter noise, have a given threshold of detection, detect patterns of inputs (instead of a single input), produce temporally defined responses (single peak, oscillations) etc., as already demonstrated for molecular programming in the solution-phase. All of these functions can be useful to create smarter and more efficient diagnostic tools.
- Circulating free DNA are important but challenging biomarker candidates because they are present at very low concentration in plasma.
- MicroRNA miRNA present in blood sample is also linked to various diseases. A sensitive, specific, robust and cheap detection scheme would make them valuable for clinical diagnostic.
- miRNA For example in the case of miRNA, despite the complexity of understanding of miRNA regulation, fundamental research has established that each tissue expresses different miRNA sequences with heterogeneous level of production. Likewise, each cancer disease involves a variety of miRNA deregulation and thus exhibits a specific miRNA signature. From this observation, it appears primordial for clinical diagnosis, tumor classification and treatment to have highly multiplexed assays able to reveal miRNA expression patterns.
- microspheres can be programmed to stay inactive for a very long time in the absence of a specific triggering signal and switch on their fluorescent signal upon specific target exposure, and that this can be done in parallel for multiple targets. This could be applied to the simultaneous detection of multiple miRNA in one biological sample, thereby enabling more robust diagnostic through the precise classification of the tumor miRNA pattern. Because molecular programming techniques allows to adjust the amplification threshold it is possible to adjust the sensitivity of each particle and thus have a large dynamic range of detection, even using only end-point readout.
- the present embodiment integrates both sensing and detection modules within mesoporous microspheres, and these modules cooperate locally within the microsphere so that each microsphere acts as autonomous sensing component (when immersed in the processing buffer).
- Zhang et al. reported the use of large DNA-functionalized magnetic particles for the detection of nucleic acid (NPL 41). This study is fundamentally different from the present invention in that the particle is surface-functionalized with a unique DNA strand that catalyzes the basic EXPAR reaction. The readout is given by the fluorescence of a single microsphere brought under the field of an epifluorescent microscope with a micro-manipulator, therefore limited in throughput and multiplexing. Recently, Jung et al.
- the DNA strands at the surface of the particle are of only one type, and act as passive substrate (fuel molecule) allowing a diffusing DNA walker (catalyst strand) to move along the surface.
- templates strands (modules) are bound to the microsphere allowing the on-site fabrication of short DNA strands using fuel molecules (dNTPs).
- dNTPs fuel molecules
- Northern blotting still widely used in academic research, is a separative technique that suffers from a lack of sensitivity and is not compatible with clinical applications due to tedious protocols, which induce a radiolabelling step.
- Microarrays appear as an alternative detection system due to their high parallelization capacity, however, they remain expensive and suffer from a lack of specificity since they mostly rely on the hybridization of target sequences to high packed immobilized capture oligonucleotides. Also microarrays are not sensitive enough for the detection of low levels of targets.
- PCR polymerase chain reaction
- Isothermal amplification-based techniques offer a simpler alternative to PCR and avoid the temperature cycling requirement. However, they are often affected by background due to unspecific amplification. As a result, the time-window where the small target concentration has already led to detectable signal, whereas the unspecific reaction has not yet produced signal, is typically very limited. Therefore real-time monitoring is required and end-point measurement (most convenient readout technique for diagnostic purposes) remains challenging. In particular if multiple samples have to be analyzed simultaneously, it can be very problematic to respect a very precise timing of the assay. Moreover, the most sensitive of those techniques, such as LAMP, require complex primer design and are difficult to multiplex.
- programmed particles can totally solve the unspecific amplification issue thanks to the possibility to make the system bistable, or nearly bistable, using a plurality of encoding DNA strand. Therefore background amplification can be completely removed.
- the present embodiment demonstrates that, in absence of target, programmed particles remain indefinitely in their OFF state. As a consequence end-point measurements, challenging with previous methods, are now possible.
- the molecular program can be run locally by attaching the mixture of DNA instructions on a solid microsphere.
- mixtures of DNA strands are attached to microscopic beads to obtain storable, reusable and programmed beads which are able to perform predefined molecular programs when immerged in a solution containing the necessary enzymes, cofactors, fuel and input molecules.
- the programs run locally it is now possible to perform identical but independent functions in parallel, at different locations in the same solution. This can bring significant decrease in reagent cost. It is also possible to perform many different functions, by using beads that have previously been programmed with different sets of DNA instructions and then pooled together. In this case, each type of bead can have a different barcode (e.g. a specific set of fluorescent labels) that allows the identification of the program it carries.
- barcode e.g. a specific set of fluorescent labels
- the present invention is applicable to a molecular computing component and a method of molecular computing.
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Abstract
Description
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